[test] Add clip-stroke

Soeren was the first to report a clipping regression in the xlib backend
with strokes, and provided a test case to exercise the bug. This is an
extension of his test to provide coverage of different clipping and
stroking methods.

6 files changed, 125 insertions, 0 deletions

diff --git a/test/Makefile.am b/test/Makefile.am
index eab26f0c..29c89a0f 100644
--- a/test/Makefile.am
+++ b/test/Makefile.am
@@ -217,6 +217,9 @@ REFERENCE_IMAGES = \
 	clip-push-group.quartz.ref.png \
 	clip-push-group.ref.png \
 	clip-push-group.xlib.ref.png \
+	clip-stroke.ref.png \
+	clip-stroke.xlib.ref.png \
+	clip-stroke.xlib-fallback.ref.png \
 	clip-text.ref.png \
 	clip-text.ps.xfail.png \
 	clip-text.svg.ref.png \
diff --git a/test/Makefile.sources b/test/Makefile.sources
index e99ab0e9..7b513968 100644
--- a/test/Makefile.sources
+++ b/test/Makefile.sources
@@ -21,6 +21,7 @@ test_sources = \
 	clip-nesting.c					\
 	clip-operator.c					\
 	clip-push-group.c				\
+	clip-stroke.c					\
 	clip-text.c					\
 	clip-twice.c					\
 	clip-unbounded.c				\
diff --git a/test/clip-stroke.c b/test/clip-stroke.c
new file mode 100644
index 00000000..9714dd06
--- /dev/null
+++ b/test/clip-stroke.c
@@ -0,0 +1,121 @@
+/*
+ * Copyright 2009 Chris Wilson
+ *
+ * Permission to use, copy, modify, distribute, and sell this software
+ * and its documentation for any purpose is hereby granted without
+ * fee, provided that the above copyright notice appear in all copies
+ * and that both that copyright notice and this permission notice
+ * appear in supporting documentation, and that the name of
+ * Chris Wilson not be used in advertising or publicity pertaining to
+ * distribution of the software without specific, written prior
+ * permission. Chris Wilson makes no representations about the
+ * suitability of this software for any purpose.  It is provided "as
+ * is" without express or implied warranty.
+ *
+ * CHRIS WILSON DISCLAIMS ALL WARRANTIES WITH REGARD TO THIS
+ * SOFTWARE, INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND
+ * FITNESS, IN NO EVENT SHALL CHRIS WILSON BE LIABLE FOR ANY SPECIAL,
+ * INDIRECT OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER
+ * RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION
+ * OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF OR
+ * IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
+ *
+ * Author: Chris Wilson <chris@chris-wilson.co.uk>
+ */
+
+#include "cairo-test.h"
+
+#define WIDTH 40
+#define HEIGHT 40
+
+static void
+shapes (cairo_t *cr)
+{
+    cairo_set_source_rgb (cr, 1, 0, 0);
+    cairo_paint (cr);
+
+    cairo_set_source_rgb (cr, 0, 0.7, 0);
+    cairo_arc (cr, 10, 10, 7.5, 0, 2 * M_PI);
+    cairo_stroke (cr);
+
+    cairo_set_source_rgb (cr, 0, 0.7, 0.7);
+    cairo_arc (cr, 10, 10, 25, 0, 2 * M_PI);
+    cairo_stroke (cr);
+    cairo_rectangle (cr, -5, -5, 30, 30);
+    cairo_stroke (cr);
+
+    cairo_set_source_rgb (cr, 0.7, 0.7, 0);
+    cairo_save (cr);
+    cairo_translate (cr, 10, 10);
+    cairo_rotate (cr, M_PI/4);
+    cairo_translate (cr, -10, -10);
+    cairo_rectangle (cr, -5, -5, 30, 30);
+    cairo_stroke (cr);
+    cairo_restore (cr);
+
+    cairo_set_source_rgb (cr, 0.7, 0.0, 0.7);
+    cairo_move_to (cr, 15, -10);
+    cairo_line_to (cr, 30, 10);
+    cairo_line_to (cr, 15, 30);
+    cairo_stroke (cr);
+}
+
+static cairo_test_status_t
+draw (cairo_t *cr, int width, int height)
+{
+    cairo_set_source_rgb (cr, 1, 1, 1);
+    cairo_paint (cr);
+
+    cairo_translate (cr, 10, 10);
+
+    /* simple clip */
+    cairo_save (cr);
+    cairo_rectangle (cr, 0, 0, 20, 20);
+    cairo_clip (cr);
+    shapes (cr);
+    cairo_restore (cr);
+
+    cairo_translate (cr, WIDTH, 0);
+
+    /* unaligned clip */
+    cairo_save (cr);
+    cairo_rectangle (cr, 0.5, 0.5, 20, 20);
+    cairo_clip (cr);
+    shapes (cr);
+    cairo_restore (cr);
+
+    cairo_translate (cr, -WIDTH, HEIGHT);
+
+    /* aligned-clip */
+    cairo_save (cr);
+    cairo_set_fill_rule (cr, CAIRO_FILL_RULE_EVEN_ODD);
+    cairo_rectangle (cr, 0, 0, 20, 20);
+    cairo_rectangle (cr, 3, 3, 10, 10);
+    cairo_rectangle (cr, 7, 7, 10, 10);
+    cairo_clip (cr);
+    shapes (cr);
+    cairo_restore (cr);
+
+    cairo_translate (cr, WIDTH, 0);
+
+    /* force a clip-mask */
+    cairo_save (cr);
+    cairo_arc (cr, 10, 10, 10, 0, 2 * M_PI);
+    cairo_new_sub_path (cr);
+    cairo_arc_negative (cr, 10, 10, 5, 2 * M_PI, 0);
+    cairo_new_sub_path (cr);
+    cairo_arc (cr, 10, 10, 2, 0, 2 * M_PI);
+    cairo_clip (cr);
+    shapes (cr);
+    cairo_restore (cr);
+
+    return CAIRO_TEST_SUCCESS;
+}
+
+CAIRO_TEST (clip_stroke,
+	    "Tests stroke through complex clips.",
+	    "clip, stroke", /* keywords */
+	    NULL, /* requirements */
+	    2 * WIDTH, 2* HEIGHT,
+	    NULL, draw)
+
diff --git a/test/clip-stroke.ref.png b/test/clip-stroke.ref.png
new file mode 100644
index 00000000..5bd877df
--- /dev/null
+++ b/test/clip-stroke.ref.png
diff --git a/test/clip-stroke.xlib-fallback.ref.png b/test/clip-stroke.xlib-fallback.ref.png
new file mode 100644
index 00000000..ac9ad795
--- /dev/null
+++ b/test/clip-stroke.xlib-fallback.ref.png
diff --git a/test/clip-stroke.xlib.ref.png b/test/clip-stroke.xlib.ref.png
new file mode 100644
index 00000000..76361833
--- /dev/null
+++ b/test/clip-stroke.xlib.ref.png